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Impact of Fishing with Tephrosia Candida (Fabaceae) on Diversity

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Impact of Fishing with Tephrosia Candida (Fabaceae) on Diversity Impact of fishing with Tephrosia candida (Fabaceae) on diversity and abundance of fish in the streams at the boundary of Sinharaja Man and Biosphere Forest Reserve, Sri Lanka Udaya Priyantha Kankanamge Epa & Chamari Ruvandika Waniga Chinthamanie Mohotti Department of Zoology & Environmental Management, Faculty of Science, University of Kelaniya, Kelaniya 11600, Sri Lanka; [email protected], [email protected] Received 07-V-2015. Corrected 04-III-2016. Accepted 31-III-2016. Abstract: Local communities in some Asian, African and American countries, use plant toxins in fish poisoning for fishing activities; however, the effects of this practice on the particular wild fish assemblages is unknown. This study was conducted with the aim to investigate the effects of fish poisoning using Tephrosia candida, on freshwater fish diversity and abundance in streams at the boundary of the World Natural Heritage site, Sinharaja Forest Reserve, Sri Lanka. A total of seven field trips were undertaken on a bimonthly basis, from May 2013 to June 2014. We surveyed five streams with similar environmental and climatological conditions at the boundary of Sinharaja forest. We selected three streams with active fish poisoning practices as treatments, and two streams with no fish poisoning as controls. Physico-chemical parameters and flow rate of water in selected streams were also measured at bimonthly intervals. Fish were sampled by electrofishing and nets in three randomly selected confined locations (6 x 2 m stretch) along every stream. Fish species were identified, their abundances were recorded, and Shannon-Weiner diversity index was calculated for each stream. Streams were clustered based on the Bray-Curtis similarity matrix for fish composition and abundance. Physico-chemical parameters of water were not significantly different among streams (P > 0.05). A total of 15 fish species belonging to four different orders Cypriniformes, Cyprinodontiformes, Perciformes and Siluriformes were collected; nine species (60 %) were endemic, and six (40 %) were native species. From these, 13 fish species were recorded in streams with no poisoning, while five species were recorded in streams where poisoning was practiced. Four endemic and one native fish species were locally extinct in streams where fish poisoning was active. Fish abundance was significantly higher in control streams (32-39/m2) when compared to treatment streams (5-9/m2) (P < 0.05). We concluded that fish poisoning with T. candida may have resulted in a significant reduction in species richness, total abundance and Shannon-Weiner diversity index of fish species in the studied streams at the boundary of Sinharaja forest. We recommend that this fishing practice should be strictly regulated, and to inform local com- munities about the legal status of fish poisoning, its consequences and the importance of fish diversity for local livelihoods and conservation purposes. Rev. Biol. Trop. 64 (3): 1129-1141. Epub 2016 September 01. Key words: exotic plant, Tephrosia candida, fish poisoning, Sinharaja forest. Sri Lanka, a tropical island, boasts of the lowlands and the central highlands, provides highest biodiversity per unit area of land for habitats for most of the fresh water fish species flowering plants and for all vertebrate groups (Senanayake & Moyle, 1982; Pethiyagoda, except birds in Asia (Mahindapala, 2002). 2006). Nine new fish species have been discov- However, freshwater fish species richness of ered from stream and riverine habitats in this the country is in lower range with 91 indig- area during the period of 1998-2007 (Gunawar- enous, 50 endemic and 25 introduced species. dena et al., 2007). Two-thirds of the endemic The wet zone, which includes the Southwestern fish species of the country were recorded from Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 64 (3): 1129-1141, September 2016 1129 rivers and streams, and they account for more Tephrosia is well-known as a source of than 90 % of threatened or vulnerable fish spe- flavonoids, rotenoids, terpenoids, and sterols cies (Wijeyaratne, 1993). among their secondary metabolites (Dagne, Major streams draining into Kalu Ganga Yenesew, & Waterman, 1989; Andrei et al., and Gin Ganga rivers, originate from Sinha- 2002; Olatayo, 2005; Touqeer, Muhammad, & raja rain forest (Jayasuriya & Abayawardana, Muhammad, 2013). Some of the ingredients 2008). This has been designated by UNESCO isolated from T. candida are amorphispiro- as a Biosphere Reserve in 1978, and as a World none, tephrospirolactone, tephrospiroketone, Natural Heritage Site in 1988. Inhabitants of deguelin, candidol (Dutt & Chibber, 1983), the 30 villages at the boundary of Sinharaja for- tephrosin (Morah, 1985), amorpholone (Kole, est (Wijesooriya & Gunathilleke, 2003) receive Satpathi, Chowdhury, Ghosh, & Adityachaud- a part of their daily protein requirement from hury, 1992), candidone, rotenone and scil- freshwater fish, harvested from streams and lascillin (Stephen, Mckenzie, & Wayne, 2003; rivers, as observed in Chalakudy River, West- Dagne et al., 1989). Tephrosin (C23H2207) is ern Ghats, India (Raghavan, Prasad, Anvar Ali, closely related to the commercial insecticide & Pereira, 2008). Cast net and pole and line rotenone (C23H22O6) that is widely used in are the major fishing gears used by artisanal killing undesirable fish (Olatayo, 2005). The fishers living in villages. Use of plant toxins to active ingredients of this plant are released by catch freshwater fish is illegal in Sri Lanka, but mashing and grinding the plant parts and then low income groups in local communities still introduced to the water environment. Though practice this fishing method, as they are unable Tephrosia is used in fish poisoning by local to buy fish or fishing gears. communities in all continents of the world, T. candida (Candolle, 1825) is an erect the effects of this fishing practice on wild fish herb, shrub or small tree, up to 3.5 m tall, with assemblages are currently unknown. There- straggling branches from the base (Hacker, fore, we evaluated the effects of fish poisoning 1990). The plants in this genus are widely using T. candida on freshwater fish diversity distributed in tropical, sub-tropical and arid and abundance in streams, at the unprotected regions of the world. T. candida was locally boundary of Sinharaja forest. It was hypoth- introduced in 1970s as live legume mulch, for esized that the frequent use of T. candida to weed control in tea plantations (Wijewardene, poison fish would significantly reduce fish 1984). Local communities accidentally discov- diversity and abundance, leading to their local ered the ichthyotoxic effects of its smashed extinctions in freshwater streams. plant parts, and fishing using this plant is now widespread in areas where the plant is readily MATERIAL AND METHODS available, as it has paved a new way of easy fishing in streams at the boundary of Sinharaja Sampling sites: The study was conducted forest. Villagers use plant poisons as it is an at the unprotected boundary of Sinharaja forest easy method to harvest fish from streams, a reserve (with a total forest conservation area practice that has also been observed in other is 112 km2). Sinharaja is a lowland wet ever- areas such as Guyana (Archer, 1934; Martyn & green forest that is located in the Southwest Follett-Smith, 1936; Forte, 1996; Andel, 2000), area of Sri Lanka (6°21’- 6°26’ N & 80°21’ Papua and New Guinea (Barrau, 1955), Samoa - 80°34’ E). It lies between the tributaries of (Cox, 1979), South and North America (Acev- the Kalu Ganga and the Gin Ganga rivers, and edo-Rodríguez, 1990; Kurup, Radhakrishnan, extends within the administrative districts of & Manojkumar, 2004; Bijukumar, Philip, Ali, Galle, Matara and Ratnapura, in the South- Sushama, & Raghavan, 2013) and some Afri- ern and Sabaragamuwa provinces, Sri Lanka can (Neuwinger, 2004) countries like Nigeria (Gunatilleke, Gunatlleke, Ethugala, & Esufali, (Akpa, Ajima, Audu, & Labte, 2010). 2004; Jayasinghe, Ekanayake, Bambaradeniya, 1130 Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 64 (3): 1129-1141, September 2016 & Amarasinghe, 2005). A total of seven sam- (Fig. 1). For this fishing practice, local villag- pling field trips were undertaken on a bimonth- ers crush and ground around 3-5 kg of leaves ly basis from May 2013 to June 2014. and branches of T. candida with a wooden A total of five streams were studied. Two pestle and a natural rock mortar into a pulpy streams were designated as control sites i.e. mass. The freshly prepared pulp is then simply Ima ela (C1) and Katukandi ela (C2), where thrown on the water surface in streams to poi- no T. candida fishing poisoning is practiced son the fish. The stunned, floating fish are then (NTF). Villagers living around these streams collected by hand or hand nets. They poison the do not practice fish poisoning, as T. candida is streams 2-3 times a month, but fishing is not not readily available in the area. Additionally, practiced on rainy days due to high flow rates other three streams were selected as treatment in streams. T. candida is not cultivated for fish- sites ie. Hal dola (T1), Puwakgaha ela (T2) ing purposes, but the plant is available in some and Wadagaha hena ela (T3), and where T. tea plantations, abandoned agricultural lands candida fishing is frequently practiced (TF) and in some home gardens. Fig. 1. Sampling streams at the unprotected boundary of Sinharaja forest (T1, T2, T3 - subjected to fish poisoning using T. candida; C1 & C2 - did not subject to fish poisoning). Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 64 (3): 1129-1141, September 2016 1131 Water quality analysis: Water quality and Fernando (1969); Goonathilake (2007); was monitored with a 150 m gap in three loca- Silva, Maduwage and Pethiyagoda (2010); tions in each selected stream. Water physi- IUCN (2012); Pethiyagoda, Meegaskumbura co-chemical parameters such as temperature and Maduwage (2012) and Froese and Pauly (Barannan 350 mm glass thermometer), pH (2015). Fish were immediately released to their (HACHE 10 portable pH meter), total dis- habitats after identification and enumeration.
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